Solid waste large-mixing-amount concrete prefabricated laminated slab and preparation method thereof

Abstract

The present disclosure relates to the technical field of solid waste recycling and fabricated buildings, and provides a solid waste large-mixing-amount concrete prefabricated laminated slab and a preparation method thereof. The solid waste large-mixing-amount concrete prefabricated laminated slab provided by the present disclosure comprises a prefabricated layer and a laminated layer. Transverse grooves and longitudinal grooves are formed in the surface of the prefabricated layer. During application, the grooves can be used for erecting pipelines, the contact area of the prefabricated layer and the laminated layer can also be increased, the combined effect of new concrete and old concrete is improved, the integrity of a floor slab is enhanced, and the effect of improving the overall stress capacity of the floor slab is achieved.

What is claimed is: 
     
       1. A method for preparation of a solid waste large-mixing-amount concrete prefabricated laminated slab, comprising:
 coating an interface agent in a mold, and then binding a reinforcement cage in the mold; 
 pouring a solid waste large-mixing-amount concrete in the mold, vibrating the concrete, and then pressing transverse grooves and longitudinal grooves in a concrete pouring surface by using a notch mold to obtain a concrete member, wherein the solid waste large-mixing-amount concrete consists of the following raw materials: 350 to 400 kg/m 3  of cement, 35 to 43 kg/m 3  of fly ash, 30 to 40 kg/m 3  of activated iron tailings, 930 to 950 kg/m 3  of tailing waste rocks, 870 to 880 kg/m 3  of tailing fine sand, 155 to 170 kg/m 3  of water and 3 to 5 kg/m 3  of additives; 
 carrying out curing and demolding in sequence on the concrete member to obtain a prefabricated layer; and 
 casting a laminated layer on the face, provided with the grooves, of the prefabricated layer in situ to obtain the solid waste large-mixing-amount concrete prefabricated laminated slab, wherein a concrete for casting the laminated layer is the solid waste large-mixing-amount concrete; 
 wherein the activated iron tailings are prepared through the following method that the iron tailings are sequentially subjected to mechanical activation and thermal activation, the time of mechanical activation is 1-1.5 hours, the temperature of thermal activation is 600-800° C., and the time of thermal activation is 20-30 min; and 
 the additives consist of the following components: a water reducing agent, cellulose ether and dextrin; and the mass of the cellulose ether is 0.1-0.2% of the mass of the water reducing agent, and the mass of the dextrin is 1-2% of the mass of the water reducing agent. 
 
     
     
       2. The method according to  claim 1 , wherein the fly ash is first-grade fly ash; the tailing waste rocks are continuously graded by 5-25 mm; the fineness modulus of the tailing fine sand is 2.1-2.2; and the average particle diameter of the activated iron tailings is 10 μm or less. 
     
     
       3. The method according to  claim 1 , wherein the notch widths of grooves in the transverse grooves and the longitudinal grooves are 40-60 mm, and the depths of the grooves are 10-15 mm. 
     
     
       4. The method according to  claim 1 , wherein the thickness of the prefabricated layer is 60-70 mm, and the thickness of the laminated layer is 60-70 mm. 
     
     
       5. The method according to  claim 3 , wherein the thickness of the prefabricated layer is 60-70 mm, and the thickness of the laminated layer is 60-70 mm. 
     
     
       6. The method according to  claim 1 , further comprising the step of installing embedded parts in the mold according to design requirements after the reinforcement cage is bound. 
     
     
       7. The method according to  claim 2 , further comprising the step of installing embedded parts in the mold according to design requirements after the reinforcement cage is bound. 
     
     
       8. The method according to  claim 1 , wherein the curing method is natural curing or steam curing. 
     
     
       9. The method according to  claim 1 , further comprising the step of flushing a demolded prefabricated slab until the surface roughness of the prefabricated layer reaches more than 4 mm after demolding.